Fan



FIG. 1 is a top perspective view of the fan;

FIG. 2 is a first side view of the fan;

FIG. 3 is a second side view of the fan;

FIG. 4 is a front view of the fan;

FIG. 5 is a rear view of the fan;

FIG. 6 is a bottom view of the fan. The broken lines in FIG. 6 depict parts of the fan that form no part of the claimed design; and,

FIG. 7 is a top view of the fan. 

CLAIM The ornamental design for a fan, as shown and described. 